An elite group of military assassins are preparing for an assault on the Greenbrier bunker, their mission to remove all traces of President Glass and her supporters. It is up to Deputy Marshal Mason Raines, his giant Irish wolfhound, Bowie, and a beautiful Mossad agent to stop them. But as they race across the country, new dangers threaten to disrupt their plans, including ravagers that terrorize the roadways in armored cars. 

When Mason stops to search for munitions at an Army depot, he is recruited by a corps of young cadets to help recover their missing commandant. Little does he know that the depot has become the home for hundreds of bloodthirsty survivors. Pinned down and hopelessly outnumbered, Mason must put his skills and trusty Supergrade to the ultimate test. 

Tanner and Samantha depart on a quest to put an end to President Pike's growing tyrannical rule. Along the way, they must confront the most violent of men, including a psychotic Delta Force soldier who has taken to skinning his victims, and a band of Mexican drug dealers that insist on young Samantha's help in recovering their lost payload. Only as they push into the nation's capital does Samantha realize that Tanner plans to call upon her father's killer to help them survive the terrors beneath the city.